A true and impartial account of the rise and progress of the South Sea Company wherein the Assiento contract is particularly considered : proving the great advantages that would have accrued to England by a faithful observance of it on the part of Spain : with observations on a late pamphlet, intituled 'Considerations on the American trade, before and since the establishment of the South Sea Company' : detecting the many gross misrepresentations of the author : humbly addressed to Admiral Vernon /